A bold and surprising move, although objectively not correct. It's very brave on Gukesh's part to go for complications, sacrificing a piece instead of trying to force a draw after being outprepared in the opening.
11... a8c8  12. c4e2  12... e7c5 A precise move, played just once before. Giri played it quickly, so he certainly knew the position well. 13. c1g5 A novelty. Gukesh thought for about 35 minutes before playing it. 13... h7h6 